He played junior with the Regina Pats (a Canadiens' farm team). In his last season (1949-50) he scored 44 goals and 43 assists in 40 regular season games, and 13 goals and 14 assists in 14 playoff games as the Pats made it to the Memorial Cup final.

The Canadiens had a powerful offensive team and Masnick was relegated to a more defensive role with the NHL team. He did win the Stanley Cup with them in 1952-53. Masnick was loaned to the Chicago Black Hawks for 11 games in 1954-55.

His rights were sold to the Toronto Maple Leafs in 1957, and he saw action with them in 41 games in 1957-58. That was the end of his NHL career.